An update from the original post: The emulator works with both my HDMI monitors, both directly via HDMI and via a VGA or DVI adapter. MAME works OK. It doesn't work with the old Dell monitor despite trying the video modes in recalbox.conf which are supported with the tvservice command. I've tried other video configurations in config.txt too. I ran into problems with dual xin-mo joysticks on MAME with Recalbox so I've decided to stick to Raspicade for the arcade machine and use Recalbox with a spare monitor for N64 games.